An MTA train operator died trying to evacuate commuters from a smoky fire that erupted inside a Harlem subway train early Friday.

Train operator Garrett Goble, of Brooklyn, was unconscious on the roadbed in front of the No. 2 train when first responders arrived to the 110th St./Central Park North station about 3:15 a.m.

Medics rushed him to Mount Sinai Hospital, but he could not be saved.

Three men and a woman were also rushed to Mount Sinai Hospital with serious injuries, authorities said. An additional five firefighters were taken to local hospitals with minor injuries. At least seven others were treated at the scene.

Cops are trying to determine if an arsonist set the blaze inside the second car of the Bronx-bound No. 2 as it headed into the 110th St. station.